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Jeff Olsen, Professor, Dept. of Horticulture, Oregon State University Extension Service. Serving commercial orchardists in Yamhill, Polk, Marion, Washington, Clackamas and Multnomah counties.
Resources and information for Commercial Tree Fruit and Nut growers (orchard crops grown for commercial sale).
(Information for home/backyard orchards is available from Master Gardeners and Home Orchard societies. A useful publication for general care of home orchards is EC 631 Managing Diseases and Insects in Home Orchards).